IPSec through ISA SERVER 2004

Hi experts, do you know if its possible to see ipsec traffic through
ISA Server 2004, cause by now, when a client (e.g cisco) needs to
connect through a ipsec VPN its not possible because ISA does not see
that traffic.

Thanks in advance.

--
Danux, CISSP
Chief Information Security Officer
Macula Security Consulting Group
www.macula-group.com